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Rare exoplanet 45 EP

HD 13908 c

RA 34.5609° · Dec 65.5942° · exoplanet

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Score breakdown

· 4 badges
45 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • Crowded system. One of at least 2 planets orbiting its star.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around October — that's when to go looking.

Properties

density gcc
4.27
diameter km
163279.36
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2013
dist ly
259.462
eccentricity
0.12
eq temp k
273.57
habitable zone
yes
host star teff
6255
insolation
0.9705
mag
7.52
mass earth
1630.4
name
HD 13908 c
orbital period days
931
radius earth
12.8
semi major au
2.03
spect
F8 V
sys num planets
2
sys num stars
1

Nearby objects

About HD 13908 c

HD 13908 c is a rare exoplanet. It lies about 259.5 light-years from Earth, shines at apparent magnitude 7.52, has spectral type F8 V and has an equilibrium temperature near 274 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 7.52, it is an easy target for binoculars.

Like any astronomical target, HD 13908 c is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HD 13908 c is a rare exoplanet

HD 13908 c scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Gas giant and Multi-planet system — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.